Configure the SMTP server for Sendmail

Due to restrictions on the company's intranet firewall, the following error occurs when gitlab sends an email to Gmail or another Internet mailbox via Sendmail:

Jul 14 06:48:14 gitlab Sm-MTA [12379]: r6c7hncz024915: To = <mmm@pku.edu.cn>, delay = 1 + 15: 30: 25, xdelay = 00:00:00, Mailer = ESMTP, PRI = 21452479, relay = mx1.pku.edu.cn ., DSN = \ 4.0.0, stat = deferred: Connection timed out with mx1.pku.edu.cn.

The solution is to configure Sendmail so that it can use the company's internal SMTP server to send an email. The configuration is simple. Add a line at the end of the/etc/mail/sendmail. Mc file:

Define ('smart _ host', 'smtp .mycompany.com ')

Then perform a test to create a text file:

To: csfreebird@gmail.comSubject: Test Sendmail in esrifrom: gitlab@mycompany.comtest Gmail

Run the following command:

Root @ gitlab:/OPT # sendmail-Vt </opt/mail.txt

Check the email address and send it successfully.

Now gitlab can send emails to all mailboxes without interruption.